This 555 timer based PWM controller features almost 0..100% pulse width regulation using R1, while keeping the oscillator frequency relatively stable. The frequency is dependent on values of R1 and C1, values shown will give a frequency range from about 170 to 200 Hz. Any 555 chip will do, CMOS is fine as well. Diodes [...]
Here is circuit lead acid battery Charger 6V -12V.
I use IC 555 and LM340. Read Detail more in image circuit.
lead acid battery Charger 6V -12V By 555 and LM340
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This is a power source that creates a DC voltage higher than the voltage feeding the it. It might be used to power your laptop (+18V) from a car battery (12V ~ 13.8V). It is built using very ordinary parts that should be readily available. [.....]
Read more : A low cost step-up converter by IC [...]
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